• To have your character be invisible, press R1, L1, X, 0, 0,Square, Square , R1, and 0 at the main menu. 

Level Select 

• To select any level, press R1+R2, L1+L2, Circle, Square at the main menu. 

Unlock all weapons

• To unlock all the weapons in the game, press X twice then Triangle, O, Up, Up, Down, Square, and then Triangle at the main menu.

While playing a game, press (Backspace), then type "!throw me a frickin bone here" to enable cheat mode. Then, press (Backspace) and enter one of the following codes to activate the corresponding cheat function:

RESULT CHEAT CODE

Debug mode - !rate me
Mission complete - !cut to the chase
Mission failed - !the meek
Kill selected units - !time for bed
Faster soldiers - !pump me up
Disable AI - !oh behave
Enable AI - !mojo
Random item/effect - !mona lisa
Remove disguises - !let me down

Unit receives three bombing airstrikes - !heavenly glory
Unit receives three napalm airstrikes - !this one goes to eleven
Unit receives three recons - !peep show
Unit receives nine blue disguises - !i woke up this morning
Unit receives nine gray disguises - !incognito
Unit receives flak jacket - !whistle and flute
Unit receives infinite sniper rifle ammo - !yippee!!!
Unit receives infinite air attack - !roody-pooh
Unit receives infinite plastic mending kit - !florence

Unknown - !when all else fails...
Unknown - !full monty
Unknown - !game over
Unknown - !mib
Unknown - !scotty
Unknown - !hey stifler
Unknown - !one time...
Unknown - !spiny norman
Unknown - !stay frosty
Unknown - !henry
Unknown - !harsh language
Unknown - !here's a lockpick...
Unknown - !vic fontaine
Unknown - !halloween
Unknown - !johnny rico
Unknown - !penny